In the new update, Valve finally improved the state of the matchmaking. For new players, the numbers of games will now have more impact than the behavior.
Fixed various bugs with matchmaking.
Adjusted the weight given to behavior metrics to be more focused on a very small percentage of players that were the most offensive players, rather than the general population.
Adjusted matchmaking for new players to be more sensitive to the number of games played rather than behavior. Players that are detected as smurfs however are treated primarily on their skill and less so on their game count history.
Improved the behavior scoring system and recalibrated existing behavior score values.
Improved detection of exploiters, bots, account sellers and in-game feeding. Matchmaking bans are being issued against these types of players .
Also, Conduct Reports now have support for a “Grade” system: A+, A-, B+, B, C, D, and F.